a baby grand piano planar design.

[bear]

Henry,

I was talking about the DIAPHRAGM.

The frames with the magnets might well bend with gravity too.
But IF you are putting these horizonatally (are you??) then the diaphragm will hang down. Dipping lowest in the center.

Ok?

What are you using for the conductive material and the substrate??

Looks like a good project so far.

_-_-bear

 

[JAMESBOS]

3 mm Aluminium tape and 12 um Mylar c. Both the small diaphragms weigh 8 grams.We will see how good it is when I play some sole piano music thro' it!?? Keep your fingers crossed.

 

[tyu]

James.........thanks for ALL your Time & work on the Ribbons drivers...an posting pic...Good Job...

 

[JAMESBOS]

Just finished wiring it up wants legs on, then got to finalize shape. Will give it a listen tomorrow, see or should I say hear what it's like. Had enough today. Some more pics to sort out.

 

[JAMESBOS]

LAST FEW PICTURES, NEARLY FINISHED!!

Here are the last few pictures, before I listen to , fingers crossed.!!😡Last one shows 9volt battery used for checking phase of each diaphragm.

 

[JAMESBOS]

Got to sort out 3 pair cables, then plug into wall sockets left of fireplace Then find a good piano CD if I can remember where I put them!? Or I may use an LP. Trouble is I moved them but where to, can hardly move with all the 24 speakers in my living room, about 20 Amps and 400 LP's + about 45 reel to reel tapes.And the 15 shelves jam packed with stuff, it'a good job I live on my own.

 

[JAMESBOS]

So many settings on my Amp for this and that it is almost impossible to come to any conclusion about the sound of the mini baby grand. A press of a button on the remote changes everything, time after time. Driving me crazy.

 

[geraldfryjr]

You ought to get a decent low end out of that thing !!!

What is the total surface area?

jer 🙂

 

[JAMESBOS]

468 sq inches the actual diaphragm area.

 

[geraldfryjr]

Thanks Henry !!!

The look much bigger than that !!

Here is a simulation based just upon the surface area and an Xmax of 2mm.
I just doubled the border width to the diaphragm as I don't know the exact dimensions.
I looks pretty good !!!

Cheers !!

jer 🙂

 

[JAMESBOS]

Listening to it at the moment in the middle of my living room, have to be careful I don't fall over or into it! Still playing with the various settings on my ONKYO Amp. Have got the big left one plugged into centre and the 2 smaller ones into left and right front output, so can play with differing volumes and bass and treble settings. Could take me forever to find the best settings for the Amp ETC. Will get fed up soon and start on something else, or may finish my 2 designs of planar headphones. Hopefully.Still got a few more ferrite magnets left, so may build some more different designs, just need a brainwave or a new idea from somewhere!!